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I have an ASUS laptop and I use fn f11 for volume down, fn f12 for volume up, and fn f10 for mute.
fn is the function key and is found on the left bottom of the keyboard between the ctrl and windows keys.

1 - Function Keys f1 through f122 - Configurable Function key fnDisable fn in the BIOSTo disable, or enable, the function key (fn) in the BIOS, do the following steps.

Press the power button to turn on the computer.

Press the f10 key to open the BIOS setup window.

Use the right-arrow or left-arrow keys to navigate to the System Configuration option.

Use the up-arrow or down-arrow keys to navigate to the Action Keys Mode option, and then press the enterkey to display the Enable / Disable menu.

Select the desired mode:

Disabled : Requires pressing fn key + f1 through f12 to use the action as indicated on the action key.For example, if Disabled , pressing fn + f11 will mute the sound as indicated on the key on this model PC. Alternatively, pressing f11 only will minimize and maximize a web browser if open.The action keys may vary depending on the model of notebook.

Enabled : Requires pressing only f1 through f12 to use the action as indicated on the action keys.For example, if Enabled , pressing f11 only will mute the sound as indicated on the key on this model PC. Alternatively, pressing fn + f11 will minimize and maximize a web browser if open.The action keys may vary depending on the model of notebook.

The Function keys serve various functions for various programs and with laptops, in combination with the Fn key, the function keys have additional functionality such as increasing or decreasing illumination of the screen, mute on/off, touchpad lock/unlock, switch from external to internal monitor and so on. These special functions are labeled onto the keys themselves.Here's a short list of what function keys do in various programs: